High-efficiency qualitative and quantitative analysis of various FAMEs in cell culture media using 2D-GC/FID

Eunji Jeon,Moonhee Park,Kun Cho 한국분석과학회 2022 학술대회논문집 Vol.2022 No.11

An economical and effective method for quantitative improvement of fatty acids in media

Eunji Jeon,Moonhee Park,Abhik Mojumdar,Jongsoon Choi,Kun Cho 한국분석과학회 2023 학술대회논문집 Vol.2023 No.11

사회적 자본의 붕괴와 민주적 후퇴 간 연관성 개관 : 헝가리 및 폴란드 사례 분석

전은지(Jeon, Eunji) 한국정치사회연구소 2021 한국과 국제사회 Vol.5 No.5

이 연구는 사회적 자본을 구성하는 요인 가운데 ‘신뢰’의 수준이 한 국가에서 발생하는 민주적 퇴행과 어떻게 연관되어 있을지 개괄하였다. 이를 위하여 민주적 후퇴를 어떻게 바라볼지에 대한 연구들과 더불어 사회적 자본을 정의하는 데 도움을 주는 기존 연구들을 살펴보았다. 이 연구에서 민주적 후퇴는 포퓰리즘의 등장과 같은 것으로 이해한다. 민주적 후퇴가 등장한 전형적인 사례로써 헝가리와 폴란드를 선택하였고, 두 국가가 경험한 민주적 후퇴 과정을 서술한 후 사회적 자본의 측정 지표인 신뢰 의 수준 변화를 시계열 추세 분석을 이용하여 추적했다. 분석을 위해, WVS가 설문조사를 통해 수집한 개인적 신뢰 및 집단적 신뢰 데이터들을 이용하였다. 그 결과, 두 사례에서 모두 개인적 신뢰와 민주적 후퇴 간 인과관계가 뚜렷하게 드러나지 않았다. 집단적 신뢰의 차원에서도 그 추세 변화가 민주적 후퇴와 연관되지 않는 것처럼 보인다. 그러나 민주화 이후 집단적 신뢰가 저수준으로 고착됐다는 사실을 확인할 수 있고, 이것이 민주적 후퇴 현상을 용인하는 토양이 되었을 것이라 가정할 수 있다. 현재 이용 가능한 데이터는 아주 제한적이고 따라서 강력한 결론을 이끄는 데 어려움이 있다. 그러나 이 연구가 사회적 자본과 민주주의의 관계에 관한 심도 있는 연구를 이끄는 데 도움이 될 것으로 기대한다. This study outlined how the level of Trust among the factors constituting social capital is related to democratic backsliding occurring in a country level. Hungary and Poland were chosen as typical examples of democratic backsliding, and after describing the democratic backsliding experienced by these two countries, the level of trust, a measure of social capital, was tracked. For analysis, personal and collective trust data collected by WVS is applied. As a result, in both cases, the causality between personal trust and democratic backsliding was not clearly revealed. Even in terms of collective trust, the trend fluctation does not seem to be related to democratic backsliding. However, it can be confirmed that collective trust has been fixed at a low-level after democratization, and based on this, we could assume that this low-level of trust has become the soil that tolerates democratic backsliding. The data currently available is very limited and therefore difficult to draw strong conclusions. However, this study may help deepen the future researches on the relationship between social capital and democracy.

Program Development for Geothermal Well Casing Design

Jongug Jeon(전종욱),Eunji Kim(김은지),Yongseok Jeon(전용석),Yongchan Kim(김용찬) 한국신재생에너지학회 2012 한국신재생에너지학회 학술대회논문집 Vol.2012 No.06

한국판 반려동물 애도 척도(K-PBQ)의 타당화

전은지(Eunji Jeon),최기현(Kihyun Choi),하정희(Junghee Ha) 한국재활심리학회 2022 재활심리연구 Vol.29 No.2

본 연구는 반려동물 상실에 대한 애도의 수준을 측정하기 위해 Hunt와 Padilla(2006)가 개발한 반려동물 애도 척도의 한국판 번안 및 타당화 검증이 진행되었다. 이를 위해, 반려동물을 상실한 경험이 있는 성인 총 362명 자료를 사용하여 요인분석을 실시하였다. 본 연구의 주요 결과는 첫째, 요인분석 결과 ‘슬픔’, ‘분노’, ‘외상’ 3개의 요인을 최종적으로 도출하였다. 둘째, 각 하위 요인 및 전체 척도에서 양호한 수준인 구인타당도와 신뢰도를 검증하였다. 셋째, 한국판 반려동물 애도척도는 기존의 반려동물 애도척도와 유사한 개념인 우울, 상태분노, 죄책감과 상이한 개념인 다차원적 지각된 사회적 지지와의 관련성을 확인하며 준거타당도와 변별타당도를 확인하였다. 넷째, 성별 간 반려동물 애도의 차이에서는 남녀가 비슷한 수준으로 애도, 분노, 외상을 경험하나 여성의 경우 남성보다 슬픔이 높다는 것을 확인하였다. 다섯째, 반려동물 상실 후 5년 정도까지 사람들의 외상 수준의 심리적 고통은 비슷하게 유지된다고 나타났다. 마지막으로 본 연구는 한국판 반려동물 애도 척도의 활용방안, 문화적, 성별 및 기간 별 차이, 시사점, 한계 및 향후 연구에 대해 논의하였다. The purpose of this study was to validate the Korean version of the pet bereavement questionnaire scores. We conducted a factor analysis using data from 362 adults who had experience losing pets. Our exploratory factor analysis resulted in 12 items within three factors: grief, anger, and trauma. Evidence of construct validity on each item and reliability for the K-PBQ total score were supported by confirmatory factor analysis and internal reliability value. Criterion validity was supported by positive correlations of the K-PBQ with BDI, State Anger, and Guilt scales scores. Evidence of discriminant validity was also supported by a non-significant correlation between the K-PBQ and Multidimensional Perceived Social Support. In addition, there was no significant difference in levels of bereavement, anger, and trauma between two gender groups, whereases women reported higher levels of grief than their men counterpart. Lastly, participants in our study reported a similar level of psychological pain within five years of losing their pets.

공공연구성과 실용화를 위한 데이터 기반의 기술 포트폴리오 분석: 빅데이터 및 인공지능 분야를 중심으로

전은지 ( Eunji Jeon ),이채원 ( Chae Won Lee ),류제택 ( Jea-tek Ryu ) (사)한국빅데이터학회 2021 한국빅데이터학회 학회지 Vol.6 No.2

빅데이터 및 인공지능 기술은 4차 산업혁명에 핵심적인 기술이나, 국내 중소·중견 기업의 빅데이터 분석 활용과 복합 인공지능 분야의 기술경쟁력 확보가 미흡한 상황이다. 따라서 빅데이터 및 인공지능 분야의 기술사업화를 통해 산업군 전반의 경쟁력을 강화하는 것이 중요하다. 본 연구에서는 기술 포트폴리오 분석을 통해 공공연구성과 실용화 우선순위를 평가하고자 한다. 우선 공공연구성과 정보에 대해 앙상블 기법을 적용한 딥러닝 모델을 사용하여 과제의 6T 분류 결측값을 개선하였다. 이후 6T 분야별 빅데이터 및 인공지능 융합 분야를 대상으로 토픽 모델링을 진행하여 10개의 세부기술분야를 도출하였다. 세부기술분야별 기술사업화 가능성을 판단하기 위해 기술활동성과 기술효율성을 새롭게 정의하고 측정하였다. 두 축을 기반으로 포트폴리오를 4가지의 유형으로 구분하여 기술사업화 최우선 고려 대상, 장기 투자가 필요한 기술분야 등을 제안하였다. ‘영상 및 이미지 기반의 진단 기술’은 기술활동성 및 기술효율성이 높아 시장의 수요와 사업화 역량 모두 이상적인 수준으로 나타났다. 이처럼 체계적인 산업·기술시장 분석을 통해 공공 연구성과 창출 기술의 활용을 활성화할 수 있으며 중소·중견으로의 효율적인 기술 이전 및 사업화 추진이 가능하다. Since small and medium-sized enterprises fell short of the securement of technological competitiveness in the field of big data and artificial intelligence (AI) field―core technologies of the Fourth Industrial Revolution, it is important to strengthen the competitiveness of the overall industry through technology commercialization. In this study, we aimed to propose a priority related to technology transfer and commercialization for practical use of public research results. We utilized public research performance information, improving missing values of 6T classification by deep learning model with an ensemble method. Then, we conducted topic modeling to derive the converging fields of big data and AI. We classified the technology fields into four different segments in the technology portfolio based on technology activity and technology efficiency, estimating the potential of technology commercialization for those fields. We proposed a priority of technology commercialization for 10 detailed technology fields that require long-term investment. Through systematic analysis, active utilization of technology, and efficient technology transfer and commercialization can be promoted.

Biflorin Ameliorates Memory Impairments Induced by Cholinergic Blockade in Mice

Jeon, Se Jin,Kim, Boseong,Ryu, Byeol,Kim, Eunji,Lee, Sunhee,Jang, Dae Sik,Ryu, Jong Hoon The Korean Society of Applied Pharmacology 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.3

To examine the effect of biflorin, a component of Syzygium aromaticum, on memory deficit, we introduced a scopolamine-induced cognitive deficit mouse model. A single administration of biflorin increased latency time in the passive avoidance task, ameliorated alternation behavior in the Y-maze, and increased exploration time in the Morris water maze task, indicating the improvement of cognitive behaviors against cholinergic dysfunction. The biflorin-induced reverse of latency in the scopolamine-treated group was attenuated by MK-801, an NMDA receptor antagonist. Biflorin also enhanced cognitive function in a naïve mouse model. To understand the mechanism of biflorin for memory amelioration, we performed Western blot. Biflorin increased the activation of protein kinase C-${\zeta}$ and its downstream signaling molecules in the hippocampus. These results suggest that biflorin ameliorates drug-induced memory impairment by modulation of protein kinase C-${\zeta}$ signaling in mice, implying that biflorin could function as a possible therapeutic agent for the treatment of cognitive problems.

Maslinic acid ameliorates NMDA receptor blockade-induced schizophrenia-like behaviors in mice

Jeon, Se Jin,Kim, Eunji,Lee, Jin Su,Oh, Hee Kyong,Zhang, Jiabao,Kwon, Yubeen,Jang, Dae Sik,Ryu, Jong Hoon Elsevier 2017 NEUROPHARMACOLOGY - Vol.126 No.-

<P><B>Abstract</B></P> <P>Schizophrenia is a chronic psychotic disorder characterized by positive, negative, and cognitive symptoms. Primary treatments for schizophrenia relieve the positive symptoms but are less effective against the negative and cognitive symptoms. In the present study, we investigated whether maslinic acid, isolated from <I>Syzygium aromaticum</I> (clove), can ameliorate schizophrenia-like behaviors in mice induced by MK-801, an N-methyl-<SMALL>D</SMALL>-aspartate (NMDA) receptor antagonist. After maslinic acid treatment in the MK-801 model, we examined the behavioral alteration and signaling pathways in the prefrontal cortex. Mice were treated with maslinic acid (30 mg/kg), and their behaviors were evaluated through an array of behavioral tests. The effects of maslinic acid were also examined in the signaling pathways in the prefrontal cortex. A single administration of maslinic acid blocked the MK-801-induced hyperlocomotion and reversed the MK-801-induced sensorimotor gating deficit in the acoustic startle response test. In the social novelty preference test, maslinic acid ameliorated the social behavior deficits induced by MK-801. The MK-801-induced attention and recognition memory impairments were also alleviated by a single administration of maslinic acid. Furthermore, maslinic acid normalized the phosphorylation levels of Akt-GSK-3β and ERK-CREB in the prefrontal cortex. Overall, maslinic acid ameliorated the schizophrenia-like symptoms induced by MK-801, and these effects may be partly mediated through Akt-GSK-3β and ERK-CREB activation. These findings suggest that maslinic acid could be a candidate for the treatment of several symptoms of schizophrenia, including positive symptoms, sensorimotor gating disruption, social interaction deficits, and cognitive impairments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NMDA receptor hypofunction induces behavioral problems like hyperactivity and abnormal social interaction and cognition. </LI> <LI> Maslinic acid normalized the MK-801-induced alterations in phosphorylation levels of Akt-GSK-3β and ERK-CREB in the PFC. </LI> <LI> Maslinic acid would be useful against NMDA receptor hypoactivity, such as schizophrenia. </LI> </UL> </P>

How Does Live Commerce Affect Customers?: An IT affordance perspective

Eunji Choi,Seongmin Jeon 한국경영정보학회 2021 한국경영정보학회 학술대회논문집 Vol.2021 No.11

The development of technology and media and the pursuit of non-face-to-face communication due to the COVID-19 pandemic have increased the influence of live commerce, a real-time streaming shopping channel. This study built a theoretical model of IT affordance (visibility, guidance shopping, trading, and meta-voicing), and it conducted an empirical analysis on how live commerce affects engagement with customers in South Korea through survey data on 428 individuals who have used live commerce. In addition, this study performed four types of scenario experiments on whether social cues and engagement influence customer engagement. Hence, this study verified the importance of understanding the meaning of IT affordance for live commerce.

Simple Solvent Engineering for High-Mobility and Thermally Robust Conjugated Polymer Nanowire Field-Effect Transistors

Jeon, Gyeong G.,Lee, Myeongjae,Nam, Jinwoo,Park, Wongi,Yang, Minyong,Choi, Jong-Ho,Yoon, Dong Ki,Lee, Eunji,Kim, BongSoo,Kim, Jong H. American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.35

<P>Electron donor (D)-acceptor (A)-type conjugated polymers (CPs) have emerged as promising semiconductor candidates for organic field-effect transistors. Despite their high charge carrier mobilities, optimization of electrical properties of D-A-type CPs generally suffers from complicated post-deposition treatments such as high-temperature thermal annealing or solvent-vapor annealing. In this work, we report a high-mobility diketopyrrolopyrrole-based D-A-type CP nanowires, self-assembled by a simple but very effective solvent engineering method that requires no additional processes after film deposition. In situ grown uniform nanowires at room temperature were shown to possess distinct edge-on chain orientation that is beneficial for lateral charge transport between source and drain electrodes in FETs. FETs based on the polymer nanowire networks exhibit impressive hole mobility of up to 4.0 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP>. Moreover, nanowire FETs showed excellent operational stability in high temperature up to 200 °C because of the strong interchain interaction and alignment.</P> [FIG OMISSION]</BR>